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The muscle that causes the hair to stand on end when a person is scared or cold is known as the:

a) cuticle
b) papilla
c) medulla
d) arrector pili

1 Answer

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Final answer:

The arrector pili muscle causes hair to stand on end, resulting in goosebumps as a reaction to cold or fear, controlled by the sympathetic nervous system.

Step-by-step explanation:

The muscle that causes the hair to stand on end when a person is cold or scared is known as the arrector pili. This response is controlled by the sympathetic nervous system and is a reflex that helps the body conserve heat or may occur during emotional responses like fear. The arrector pili is a smooth muscle that pulls on the hair follicles, making the hair stand up and causing goosebumps.

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